In order to resolve the abnormal start-up noise issue for a dual-motor type hybrid vehicle,this work carried out an in-depth analysis of the mechanism and root cause of the abnormal start-up noise for this hybrid vehicle.The work shows that the drive train gear rattle caused by the powertrain excitation during the starting process is the main reason for the abnormal starting noise.The powertrain sound quality under start-up process can be effectively improved by controlling the position of the crankshaft at the time of the engine start-up to reduce the excitation,and adjusting the system inertia or applying a compensation torque in the generator during the speed insreasing process to reduce the speed fluctuation of the powertrain.
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